CVE-2026-4408

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.
References
Link Resource
https://access.redhat.com/errata/RHSA-2026:22644 Issue Tracking
https://access.redhat.com/errata/RHSA-2026:22963 Issue Tracking
https://access.redhat.com/errata/RHSA-2026:25049
https://access.redhat.com/errata/RHSA-2026:25979
https://access.redhat.com/errata/RHSA-2026:28053
https://access.redhat.com/errata/RHSA-2026:28054
https://access.redhat.com/errata/RHSA-2026:28055
https://access.redhat.com/errata/RHSA-2026:28056
https://access.redhat.com/errata/RHSA-2026:28057
https://access.redhat.com/errata/RHSA-2026:28058
https://access.redhat.com/errata/RHSA-2026:28132
https://access.redhat.com/errata/RHSA-2026:29799
https://access.redhat.com/errata/RHSA-2026:29833
https://access.redhat.com/errata/RHSA-2026:29863
https://access.redhat.com/errata/RHSA-2026:56786
https://access.redhat.com/errata/RHSA-2026:56853
https://access.redhat.com/errata/RHSA-2026:56911
https://access.redhat.com/errata/RHSA-2026:57483
https://access.redhat.com/errata/RHSA-2026:59831
https://access.redhat.com/errata/RHSA-2026:60019
https://access.redhat.com/security/cve/CVE-2026-4408 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479762 Issue Tracking Third Party Advisory
https://bugzilla.samba.org/show_bug.cgi?id=16034 Issue Tracking Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:22644 Issue Tracking
https://access.redhat.com/errata/RHSA-2026:22963 Issue Tracking
https://access.redhat.com/errata/RHSA-2026:25049
https://access.redhat.com/errata/RHSA-2026:25979
https://access.redhat.com/errata/RHSA-2026:28053
https://access.redhat.com/errata/RHSA-2026:28054
https://access.redhat.com/errata/RHSA-2026:28055
https://access.redhat.com/errata/RHSA-2026:28056
https://access.redhat.com/errata/RHSA-2026:28057
https://access.redhat.com/errata/RHSA-2026:28058
https://access.redhat.com/errata/RHSA-2026:28132
https://access.redhat.com/errata/RHSA-2026:29799
https://access.redhat.com/errata/RHSA-2026:29833
https://access.redhat.com/errata/RHSA-2026:29863
https://access.redhat.com/errata/RHSA-2026:56786
https://access.redhat.com/errata/RHSA-2026:56853
https://access.redhat.com/errata/RHSA-2026:56911
https://access.redhat.com/errata/RHSA-2026:57483
https://access.redhat.com/errata/RHSA-2026:59831
https://access.redhat.com/errata/RHSA-2026:60019
https://access.redhat.com/security/cve/CVE-2026-4408 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2479762 Issue Tracking Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4408.json
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-28 09:16

Updated : 2026-09-04 13:19


NVD link : CVE-2026-4408

Mitre link : CVE-2026-4408

CVE.ORG link : CVE-2026-4408


JSON object : View

Products Affected

redhat

  • enterprise_linux
  • openshift_container_platform

samba

  • samba
CWE
CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')